(3z+5)(7-z)=0

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Solution for (3z+5)(7-z)=0 equation:


Simplifying
(3z + 5)(7 + -1z) = 0

Reorder the terms:
(5 + 3z)(7 + -1z) = 0

Multiply (5 + 3z) * (7 + -1z)
(5(7 + -1z) + 3z * (7 + -1z)) = 0
((7 * 5 + -1z * 5) + 3z * (7 + -1z)) = 0
((35 + -5z) + 3z * (7 + -1z)) = 0
(35 + -5z + (7 * 3z + -1z * 3z)) = 0
(35 + -5z + (21z + -3z2)) = 0

Combine like terms: -5z + 21z = 16z
(35 + 16z + -3z2) = 0

Solving
35 + 16z + -3z2 = 0

Solving for variable 'z'.

Factor a trinomial.
(7 + -1z)(5 + 3z) = 0

Subproblem 1

Set the factor '(7 + -1z)' equal to zero and attempt to solve: Simplifying 7 + -1z = 0 Solving 7 + -1z = 0 Move all terms containing z to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -1z = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -1z = 0 + -7 -1z = 0 + -7 Combine like terms: 0 + -7 = -7 -1z = -7 Divide each side by '-1'. z = 7 Simplifying z = 7

Subproblem 2

Set the factor '(5 + 3z)' equal to zero and attempt to solve: Simplifying 5 + 3z = 0 Solving 5 + 3z = 0 Move all terms containing z to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + 3z = 0 + -5 Combine like terms: 5 + -5 = 0 0 + 3z = 0 + -5 3z = 0 + -5 Combine like terms: 0 + -5 = -5 3z = -5 Divide each side by '3'. z = -1.666666667 Simplifying z = -1.666666667

Solution

z = {7, -1.666666667}

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